Intrusive and Extrusive Igneous Rocks

Intrusive and Extrusive Igneous Rocks

Intrusive rocks cool slowly and extrusive igneous rocks cool rapidly; this leads to different crystal sizes.

CK-12 (High School)

ESSENTIAL QUESTION:

What determines whether an igneous rock is intrusive or extrusive?
STANDARDS:
RST.2 - Main Ideas

DEPTH OF KNOWLEDGE (DOK) LEVELS:

2,3
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